Automatic calling device



April 7, 1925. 4 1,532,674 1 J. G. BLESSING AUTOMATIC CALLING DEVICE Filed vJan. l1 1921 UNITED STATES PATENT OFFICE.

JOHN G. BLESSING, or c HICAGO, ILLINOIS, ASSIGNOR TO AUTOMATIC ELECTRIC COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

auronarro CALLING DEVICE.

Application filed January 11, 1921. Serial No. 436,532.

To all whom it may concern:

Be it known a citizen of the and a resident that I, JOHN G. Bnnssmc, United States of America, of Chicago, Cook County,

and State of Illinois, have invented certain new and useful Improvements 1n Automatic Calling Devices,

ing is a specifica My invention of which the followtion. I relates in general to an automatic calling device and more specifically to an improved type of calling device for use with standard two wire automatic switches or any other type are operated by the telephone.

of switches which opening the line circuit at Among the objects of my invention are to lating the of improve rovide, an lmproved governor for reguspeed of such a device; a brake character which acts to prevent forcing or speeding the device; an improved means springs in such a, device;

for operating the shunt improved stop for limiting the movement thereof and to provide other detail which tend to ed features of improvement simplify and. greatly 1mprove the operation, and efficiency thereof and which will be fully operation explai fication.

described and their ned in the following speci- In Fig. 1 of the drawing I have shown a front view of ti 1e calling deviceof my invention with the cap removed to show the power spring.

Fig. 2 is a rear view showing the operating elements and governor.

Fig. 3 is a view taken the cam or the shunt springs.

Fig. 1 showin its springs an from the top of interrupter. with Fig. 4 is another front view of the device with the finger hole removed showing the dial and number plate various gears and other operating parts. Fig. 5 is a back view of the finger hold dial showing th e gear and ratchet devices mounted thereon.

Fig. 6 is a view of the cap which is arranged to snapover front of the finger the cup spring on the hold dial of Fig. 1.

Fig. 7 is a detailed "side view of the gov- Referring now to the drawings 1 will de- My improved mounting plate device is composed of a 2 upon the front of Which is mounted a finger hole spring 5,

cal wall. This ring dial 1 by means of a screw 3. This dial has the usual ten finger holes and carries acup 4 enclosing a clock one end of which is fastened in an opening in the side of the cup 1 and the other end of which is slotted to fit over a small lug on one side of the screw 3. As the finger dial is turned it will 'be under stood that tension is stored in the 5 ring 5, the screw 3 being fastened'into a t read'ed opening in the mounting plate 2, and the dial when released will rotate back to normal. A finger stop 6 is mounted on the under side of the cup 2 and projects over the dial 1 to limit its forward movement.

A pair of openings 7 are provided in the dial 1 to receive the two prongs 8 of the.cap 9 (Fig. 6) which is a thin metal device upon which letters or names are stamped and which snaps into place covering the spring 5. The screw 10 projects through the. finger dial and cooperates with a part 11 (Fig. 4) to stop the return movement of the dial. The mounting plate 2 is cut out of one piece of light metal such as aluminium and has a projecting ring which may be seen in Figure 1 which surrounds the finger dial to protect the same from being bent.

Referring now to Fig. 2 it will be seen that the rear of the plate 2 has a raised shoulder 12 which is circular in form but the outer edge of which is i the form of a circle the center of which is ofiset from the center of the circle forming the outer edge of the plate 2. The circle forming the inner edge of the shoulder 12 is concentric with the outer edgeof the plate 2 so that the shoulder 12 is thicker. on one side than on the other and thus also making the distance from the outer edge of the shoulder 12 to the outer edge of-the plate 2 greater on one side than on the other. This permits the dial to be mounted in the cup on the telephone base nearer horizontal. Just inside the shoulder 12 and lying loosely therein is a circular ring 13 having a base portion and a cylindriscrews 14 which permit it to turn mounted on a rigid shaft 15 device 16 which consists of pair of freely. Loosely is a governing hub having a gear 7) a plate 18, the outer edge of grooved and three outwardl extendin arms 19 e h ent i l'ward at its outer on 13 is held in place by a 17 at its rear end (see Fig. 1

which 1s and having holes at the outer end of each arm and another hole aligning therewith in the hub. Each arm carries a pin 20 weighted at its outer end and having a leather or other friction. surface on the outer ends ofcause any clockwise movement of the ring 13 to be effective to force spring 21 further into the groove of plate 18. Now as the pins 20 rub against ring 13 and tend to turn it clockwise the movement is resisted by the spring 21 and when the friction betwcenpins 20 and ring 13 is above normal this spring 21 presses against the grooved edge of plate 18 thus acting as a brake thereon. A disc cam 24 semi circular in form, of insulating material, is mounted on one end of a shaft which projects through the plate 2 and carries on its other end a gear wheel 25. As this gear 25 is turned it operates the cam 24 tobreak the contact of the pair of interrupter springs 26' and 27 (Figures 2 and 3) which may be connected in the circuit over which it is desired to transmit impulses. On the other side of the cam 24 are mounted three shunt springs 28, 29 and 30 which may be used to shunt the transmitter and open the circuit of the receiver or may be arranged to shunt both as desired. Under the end of spring 29 is a pin 31 which is inserted in a hole which passes through plate 2. This pin has a shoulder which is pressed against the plate 2 by the tension of spring 29. This pin 31 is at times, when the dial is normal, pressed outward to open the contact of springs 29 and 30 and close springs 28' and 29 in contact as will be explained. Referring to Figure 4 there is shown a view of the front of the calling device with the finger dial 1 removed and the-number plate, which fits under the dial and is fastened by screws at 32, removed also. In this figure may be seen a circular spring 33 fastened at one end by screw 34. This spring 33 is tensioned so that it tends to stand away from the plate 2 and carriesa raised shoulder 11 which projects toward the finger dial and lies in the path of the screw 10 which projects on the under side of the dial. A pin 35 is firmly secured to the spring 33 and the pin 31 which controls the shunt springs projects through plate 2 and lies under a part of spring 33. The screw 10 in the dial is so positioned that as the dial stands in normal position the screw 10 presses against the shoulder 11 forcing the pin 35 into the path of the governor, as shown in Figure2, andpresses the pin 31 in such a manner as to open springs 29 and 30 and close springs 28 and 29 in contact. j

On the under side of the finger dial 1 (see Figure 5) is a hub 36, loosely mounted on which is a unit gear and ratchet wheel hav-* ing ratchet teeth 37 on the side next to the dial and gear teeth 38 underneath. A pawl 40 is secured to the under side of the dial 1 unit with the gear 42, which is also loosely.

and which lies mounted on a stud on plate 2 portion of plate 2 which is deep in a recessed enough to governor hub rests, thus permitting the gear 42 to mesh the teeth of the gear 17 (Figures 4 and 7) to turn the governor. The gear 42 also meshes with the teeth of rotate the cam 24. a

It is thought that from the above detailed description of the various co'-acting parts of my device that it will be clear that, when the subscriber inserts a finger into one of the holes of the dial and draws it forward in a clockwise direction, the screw '10 first leaves the shoulder 11 of spring 33, removing the lock 35 from the path of the governor and permitting springs 28 and 29 to meet the opening in which the gear 25 to open contact and springs 29 and 30 to close I gear 42. Gear 42 operates the cam 24 through gear 25 and also operates the governor 16 through its gear 17. The. governor 16 governs the speed ment as described and as the dial returns to normal spring 10 again meets the shoulder 11 to project the stop 35 into the path of the governor to stop further rotation and also operates the shunt springs to close springs 28 and 29 and open springs 29 and 30.

It will be seen therefore that I have provided a very efficient type of automatic calling device which has a number of new and novel features of improvement and having fully described'the said details of improvement and the method of operation, what I consider to be new and desire to have protected by Letters Patent will be pointed out in the appended claims.

What I claim as my invention is:

of the return move-' 1. In a calling device, a governor for regulating the speed of the impulse mechanism, saidgovernor comprising a gear driven hub having radially projecting arms, a weighted pin loosely inserted in each arm and having an unrestrained endwise movement therein, and a circular surface surrounding said governor. and frictionally engaged by said pins as the mechanism operates toretard the same.

2. In a calling device, a governor for regulating the speed of the impulse mechanism, said governor comprising a gear driven hub having radially projecting arms, a weighted in loosely inserted in each arm and movab e endwise therein, a movable circular surface surrounding said govcronr and frictionally engaged by said pins as the mechanism operates to retard the same,

'and a brake for also retarding said mechanism when said surface is moved.

3. In a calling device, a governor having a frictional surface and a plurality of frictional surfaces riding thereon, said governor having additional frictional surfaces engaging only when the friction produced by said first surfaces exceeds that which is normally produced, one of said last frictional surfaces being in the form of a 5 ring which constitutes the means by whie said last frictional surfaces are normally prevented from engaging.

4. In a calling device, a governor having a frictional surface and a plurality of members engaging therewith, additional frictional surfaces, said first surface comprisin a normally stationary ring surrounding sa1d additional surfaces and movable when the friction produced by said members exceeds a glven amount to bring said additional surfaces into engagement.

5. In a calling device, a centrifugal governor for regulating the speed of the' impulse mechanism, said governor comprising a series of radially extending'arms carrying loosely mounted pistons,..and a ring surrounding said pistons and engaged thereby when the mechanism is operating, said ring stationary in the normal operation of the device, but movable with an increase of speed to apply a brake to said governor.

6. In a governor, a rotatable shaft, a floating ring concentric with said shaft, friction devices attached to said shaft and adapted to engage the inside surface of said rin under the action. of centrifugal force,

an braking means controlled by said ring for limiting the speed of said shaft.

7. In a governor, a rotatable shaft, a floating ring concentric with said shaft, friction devices attached to said shaft and adapted to engage the inside surface of said ring under the action of centrifugal force, a braking member operated by said ring when the same is moved by the engagement therewith of said friction devices, and a brake surface secured to the shaft and 'engaged by said braking member when the same is operated.

8. In a governor, a rotatable shaft, a floating ring concentric with said shaft, friction devices attached to said shaft and adapted to engage the inside surface of said ring under the action of centrifugal force, a. grooved pulley mounted on said shaft, and a steel wire arranged to engage the surfaceof the groove when the said ring moves responsive to the engagement of sa1d friction devices.

9. In a speed governor, a normally stationary ring, means inside said ring for engaging the same due to centrifugal force when the governor is in operation, supportthe said member is rotated, supporting means permitting said member to move responsive to the resulting friction, and a retarding device brought into frictional engagement with said member by movement of said ring.

11. In a speed governor, a normally stationary ring, a spoked Wheel having a grooved hub inside saidring, weights on the ends of said. spokes adapted to engage the inside surface of said ring when the wheel is rotated, supporting means for said ring permitting the same to move when so engaged, a wire lying in the groove in said wheel, and a connection between the ring and wire whereby the latter is forced into frictional engagement with the sides of the groove when the ring is moved.

12. A speed regulating governor comprising a gear driven member carrying a plu rality of frictional members, each frictional member having sufficient space in said gear driven member to allow an unrestrained movement therein, and a circular surface surroundin said frictional members en gaged by t em as the mechanism rot-ates to maintain the speed constant.

Signed b me at 7th day of danuary, 1921.

Chicago, Illinois, this 1 0 

